Telephone-exchange system



Fled Aug. 24, 1920 H P CLAUSEN ET AL TELEPHONE EXCHANGE SYSTEM N QQ IlL s@ I w 4 4. HT n ,.H ,QQ w w A QQ Char/aal.. Gand/fum by Affy.

Patented Apr. 11511-, 1925.

Sidi@ .1.a L. GOODRUM, OF NEW YORK, "GEEPANY, ENCORPORATED, OF NEW YORK, N. Y., CORPGB-ATIQN QF NEVI YORK.

TELEPHONEEXCHANGE SYSTEM.

f 'application tiled August 24, 19.20. Serial No. 405,771.

To all ,co/1021i tmag/ concern:

` Be it known that w' I Nar i. @nies f andV CHARLs LfGooonoar. citiaensof `the United States, residing hfiamaroneck, in the countyL of Westchester and State or New York, and at New York, in the county of New York, State of New York, respectively, have invented certain new `and useful Improvements in Telephone-Exchange Systems, of Awhich 4thefollowingl is a Lfull, clear,

concise, and :enact description.

This invention relates to ln'iproivements in telephone Ve..\cha.nge 4systems and has par- V ti'cular reference to a circuit arrangement lil `for switches.

In automatic L,and senii-aiitoinatic telephone systems it` 1s customary to provide trunk circuits between Vdifferent groups oi switches and Vexchanges of a suiicient number to handle theaverage tramo. During very busy periods, when thetraiiic exceeds the average, it often occurs that at the particular'moment call being extended, all trunk circuits are busy, whereas shortly or immediately thereafter one or more of the .trunk circuits becomes idle. ySystems have been devised in which calls are set upon registers, land incase no trunk circuits are immediately available, ltheca-ll is held until aftrunk circuit beeoines idle. in such cases impulses t'or operating' switches Ito extend the calling line ftoA a cailed subscriber are always stored up in registers.

The present invention contemplates the provision ofl sans whereby an impulse storing' mechanism or register will beutilicced only. 11n case all thetrunk circuits ojtf ay group are( busy, 'the call being normally en e l ndcd through a switch and over a trunk circuit terminating' therein to |the exclusion of the impuls'estoring mechanism. Iivhowever, in extending call, all trunk circuits" ot Aa sele.cted"'gro,up leading` from a particular selector switch are found busy, the selector switch will be held `andthe impulsestoring mechanism will beplaced inoperative re lationship with the impulse sen-ding device. The remaining impulses of the set nec-essary for extending the calling to the called snbscriberare then conveyed 'to the impulse storing mechanism wherein they'ar-e stored. As soon 'as 'aftrujnk circuit becomesy idle, the switch is caused to seek such trunk and the 'i ulsexstoring 'mechanism 'placed a condition to deliver its impulses for the purpose of cont-rollingthe remaining selector switches ot the train.

The inventive idea as involved is capable` of receiving a variety ot expres .o One 'for the purposeI ot illustrating the invention is shown in the accompanying drawing; but it is to be expressly understood that `such drawing is employed merely for the purpose of facilitating the description of 4the invention as a whole and not to define the limits thereof, `reference being had to the appended claims for this purpose.

In theI anneed drawing in which there is illustrated diagrammaticallya circuit a1"- rangement and mechanism employed `in carrying out the invention, there is shown the station of a. calling subscriber 100, a. selector switch S, a schematically represented line switch N and an impulse storing mechanism.

It is believed that the invention will be fully understood from fthe following, detailed description ot the operation. Vhen a call is initiated by a subscriber removing the receiver irom its switchhook at substation 100, a circuit is closed to operate the lineswitch and to extend the lline of the calling subscriber to the selector switch S in a manner well-known in the art. A circuit is then closed for line relay 120 ot ,the selector switch S over a path extending from ground, righthand winding,- of relay 120, side-switch arm 121 in its first position, contacts 110 of switch L, conductor 108, terminal 106, brush 103, through the substation loop, brush 104, terminal 107, conductor 100, contacts 111 of switch L, sideswitch arm 122 in its rst position, and lefthand winding ot relay 120 to grounded battery. Relay 120 is thereupon energizedland at its armature and front contact estab lislies a circuit for slow-torelease relay 123. Relay 123 in energizing completes a circuit for relay 198 over a path extending from ground front contact and left lia-nd armatureof relay 128 contacts 197, winding of relay 198 grounded battery.-` Relay'QS in operatingr locks yupthrough its front contact and armature. The selector is now in condition to receive impulses transmitted from ay sending device 101`atvtlie calling sub-station to operate the switch at its pri-- mary or group selectingl movement. The first deenergization ot' reiay 120,111 response turero sloW-to-release relay 123 and bach Vlay 124 opens the circuit kthe test terminals of busy trunks.

to the impulses establishes a circuit lor the second sloW-to-release relay 1211, i' tmnling Yfrom grounded battery, winding et relay lll- 121'-, front Contact and right hand f;

contact armature ol relay 120 to ground. Relay 12% being. slow-to-release n'iaintains its armature attracted during the ti nsin 3- sion of the impulses. The energization or relay 124 establishes rcuit rer esca@ magnet 126 extending tery, Winding et mag 12.5 in position 1 and armature slon'fto-release ground. net 12x in energi.

time has no eileet upon the sidcsuxxn .uw

which thereupon rele ses side-switch'Wipers into position assume that one or more trunks ot the selected group are idle. ln that case tential YWill be present terni' `When side-switch wiper moves i second position7 a' self interrupting circuit is established flor secondary stepping` in: net 146, and the brushes lle@ to 1i of the switch flare stepped i` trunl; hunt ing movement over the tern. nals of the selected group until an idle trunk is found.

'At the iirst cnergization ot secondary Vmagnet 1&6, the armature ot escape'inagnet 126 is moved to its operative position. it

thc lirst trunlf; ot' the SelectedQ'roup is busy, ground will be present on test terminal 199 t-hereolj and magnet'll' will be yncrgized I.) over a path extending Vtroni Ygrouin edbat-` tery5 Winding ol'escapc magnet 12S, side switch Wiper12 in its second position, conductor 189j brush 1410, to grounded test rlhe escape magnet 125 rees li hen no ground is found upon a test terminal or. the selecte-d greui the escape inaenl; 126 Will release to more the side switch wvip-ers ofthe selected switch Sinto their third positions. The calling line vis new extended to the next succeeding switch which may be similar to the switch shown. 'ln meting terminal 199. mains energized as long as lnusl 11i-0 ei completes a circuit for a release magnet li/lasijn et 132 is opened and magnet 132 selected group are busy.

nasales from position 2 to position-8, the side switch Wipers 121 and 122 interrupt the circuit for relay 12()V which deenergizes and causes the release of relay 123. This relay is sloW-to-release and Vbefore it retracts its arn'iatures, theV test terminal the sel-ct trunk is grounded at the succeeding s Witch due to the energization oi" a elondo-release relay corresponeing to relay 12S7 vin respons-e to the energization an impulse relay theieat corresponding to relay This ground causes the trunk to tes to other selectors and oper; lay 150,151 or 152 associate-d tlieron ien u by attracting its armature closed one break between the terminal 1 ground. 'i i ground referred vto is also extended 'to the test multiple 105 tohold the line switch set in the Aiyell-lfiiown manner. This circuit leads over test conductor side switch arm 12@T and its third Contact, conduct-or 180, multiple 105,V brush 102 tothe Y 123. lmpulses now transmitted from the sending device 101., will o ate the succeeding switch and the extension ot a call may continue through other switches until the ca led line is reached.v

it the termination of a conversation, the eplacing of thereceiver upon the switch hook at substation 10) Will cause the ground at the connector to be renioredro-in the ref leas-e conductor 189 in a mann er Weil lniou'n 'n the art resulting in the release of relay 198. Trl-elay 198 in re"racting it VLure 132 over a circuit extending from grounded battery7 Winding of magnet 132,v primary oll normal contacts 133l and bacl-z conti-uit and outer armature of relay 198 to ground.

operates to restore the switcu to normal position whereupon contact les Y is thus pern'iittee to release.

TW e will next assume that call has beenv extended to selector sii/i `ch S and that said( switch has been operated in its primary selecting movement to select aY particular group of trunks and that all trunks in the ln this instance,V all relays 150, 151 152 oit the selectedgroup Will be operated and ground will hepresent on the test terminal 1411 common to said trunks.

V,a path entending from groundcr A spring Q is pletes a circuit ai Contact. .tor pli. attracti its ari i 112 and 113 and opens the contacts 116 and 111 ot the switch L, thereby disconnecting` the impulse relay,v from the calin tion 160, and connecting impulse relai' thereto. Relay 161 is then cnergif/.d

lett-hand winding ot relay 161, l 1,12, conductor 168, terminal 166, hrush 1U? through the substation loop, brush 161., terminal 10T, conductorI 109, contacts 11?. and right-hand winding ot relaj-,iY 161 to groun l. Relay 161 in energizing rovi.- pletejs a circuit at its armature and ont contact for slow-to-release relay 1.62.

though relay.7 126 was disconnected trom calling station when magnet- 166 was energized, the said relay 120' was not dcenergized due to a. holding circuit there'lfor being maintained over a path' feb-tending from .grounded battery, lett-hand winding; ot rela7 120, si-de switch wiper 122 in i second position, contacts 11;" ot switch l. contacts 153/1, 185 and 186, contacts 116 o switch L, side switch wiper 121 in its second position, and right-hand `winding ot relaji7 126 to ground. The selector switch is thus prevented from releasing.

Relay 161 associated with the impulse storingmechanism now responds to impulses transmitted from the sending device 161. rlie lirst cle-energization oit relayY 161 in response to .the impulses, establishes a circuit tor the second slow-to-release relay: 16B, `over a. Apat-h extending jfrom grounded battery, winding ot relai: 163, front contact and right-hand armature of slow-to-release relay 162, and hach contact and arn'iature-oii rela)v 161 to ground. Relay. heing slow-torelease maintains its armature attrzmted during the transmission 'of impulses. Energizationot rel-a5.7 163 establishes a circuit tor the escape magnet 170, over a path extending from grounded hatteny, \.i.'indinpof rscape inagnetlO, side switch wiper 1TB. iu its first position, and armature and t .uit Contact of relay 163 to ground. Magnet 1 "l l e' i in energizing, at this time, has no effect on the side switchinechanisin associated with the impulses storing mechanism. .Fach deenergii'zation ot relayv 161 also closes a circuit 'tor stepping magnet 1651, over path entending` from grounded battery, winding ot niagnet 165, side switch wiper 1611 in its first position, liront contact and riglit-hand armatureof slow-to-.release 162, and hack contact and armature o1" relayY 1,61 to ground. ln response to each impulse, magnet 165 operates pawl 166 to step the impulse wheel 167 in a counter clockwise direction. A tixedfto the impulse wheel 1.6? totension said wheel when it is moved frournorznal position that said pulse wheel, contacts 116 are opened and contacta; il are closed.

.1t 'the term' uition ol the series ol im- "olaf lill remains energized and thus peimanentlj.r opens the circuit or relay 1651, ..rhich after an interval releases. 'Vlie deenere'ization of relay 1621 opens the cire-nil: 'for e: fe magnet 1T() which thereupon releases and moves the side switch arms into posi- I"on 2.

lfn the particular arrangement shown. an impulse storing mechanism cap-.dile et .storing; three series of impulses is shown. 'lt is to he understood, however. that the mechanism may.Y he designed to store a `greater or less number ot series ot impulseQ as desired. n heu the side switch arms ot the impulse storing mechanism pass into position a circuit is prepared :tor stepping` magnet 175 over a path extending trom groinxded hattery, winding ot magnet- 11'5, side switch wiper 164L in its second position, iront contact and right-hand :u mature ot' rela;4 1.69. and hack contact and armature ot' rela )i 161. to `.ground ln response to the next series ot impulses, steppime1 magnet 175 may' he operated to actuate an impulse wheel similar to 167 in a manner similar to that described tor impulse wheel 16?. ,"it the termination of the series of impulses. slow-torelease relai.7 1653 will af'a in (leenergize, therehy opening` the circu tor escape magnet 170, resulting in the release ot' said escape magnet and the passing` ot' the side switch arm into position 3.

ln position 3 yet the side switch arms. a circuit is prepared tor stepping magnet 1'?? over a path extendinefrom grounded hatterjy, winding otl magnet 17?. .site switch wiper 164-. in its third position, trontcontact and right-hand armature ot relai.7 16:?. and hach contact and armature oft rela;7 161 to ground. ln response to the next ser-ies oi impulses, stepping magnet 17? may he aotuated to operate an impulse wheel similar to the impulse wheel 167. .fit the termination of the set of impulses, escailie magnet 170 again deenergizes in the manner heretotore described, and moves the side switch ot the impulse storing mechanism into position Il.

1t will now he assumed that, during the time that the impulses are heilig transmitted to the impulse storing mechanism, trunk circuit in the selected group has become idle. ln such ease, ground will he removed trom the test terminal 1111i due to the dcenergization of one of the relays 150, 151. 159. opening the circuit to such ;zioiunl. When no ground is present upon the test tflrininal 144, rela-y 134: will retract its armature, 1thereby then steps the brushes in their ti". .1.

.closing the self-interrupting ycircuit 'for stepping magnet 146.

1 hunting movement. Escapel magnet 126 selector switch S, as heretofore described, remains energized as long as the brush i4() oi"- the switch S passes over terminals having' ground .potential thereon.' is soon as an lidle trunl; is found, escape mae'net 126 will deenergize, thereby 'moving Vthe side switch arms oit the selector switch S into third position, whereupon the interrupting circuit for secondary magnet- 146 will he opened.

In the third position ot the side switch wipersfot the selector switch S, a circuit is closed `for retaining' magnet 195 over a path extendingl trom grounded battery, magnetthe impulse storing 195, contacts 171, side switch wiper 174 ot mechanism Vin its fourth position, contacts 118 oi switch` L, side switch wiper 128 in its third position and back contact and armature oi relay 184 to grounded battery. Magnet 195 thereupon attracts its varmatui'e thus disengaging pawl 168 .from the impulse wheel 167. Under the influencev of the spring 220, vthe impulse wheel167 is rotated in a clock-wise direction andv the teeth thereoic operate pawl 169 to open the contacts 184 a number ot times corresponding' to the impulses previously conveyed thereto, vthereby interrupting the loop .comprising brush 142, side switch arm 122 in its third position, contact 117 orn switch L, contacts 184 and 185 and 186 of the impulse storing mechanism, contacts 116 of switch L, side switch wiper 121 in its third position and brush 141 extend-- ing tothe succeeding switch. is soon as impulse wheel 167 reaches normal position, a circuit is closed for magnet 176 over a path extending' from grounded battery, winding or said mae'net, contacts 181, contacts 170, side switch wiper 174 in its fourth position, contacts 118 ot switch inside switch wiper 128 in its third position and haelt contact and armature ot relay 184 to ground. Magnet 176 may lattract an armature similar to 168 thereby causinga the release of an impulse wheel similar to 167 which, inV returning to'normal position interrupts the contacts 185 a number ot times corresponding,l to the second set ot impulses previously conveyed to the impulse storing mechanism.

As Soon as the second set of impulses 'has' been delivered magnet 17 8 will be energized over a path extending' from `@grounded battery, magnet 178, contacts 183, contacts 17S).

Vcontacts 170, side switch wiper l174 in its fourth position,fcontacts 118, side switch wiper 128 in its third position and back .contact and armature ot' relay 184 to ground. Relay 178 is thereupon energized and may disengage alpawl similar to 168 from an impulse wheel similarto 167, which wheel upon returning to normal position inter- 'tepping magnet 1-1-6.

lrioni ,gl

1.46, side switch wiper 175 in its fourth posi jion of all the trunks of the selected switch Ytor causine'the first idle trunk ru'pts the contacts'186 a number et' times corresponding to the third set of impulses previously conveyed to the impulse storing m cha ism. soon as the last set of iinpulses has been delivered the escape inagf net 1770 ene:t zed over a path extending ouncled battery, winding of magnet tion, 'contacts 182, 179 and 170, side switch wiper in its. fourth position, contacts 118, side switch arm 128 in its third position,and back Contact and armature ot relay 184 to 4ground. Escape magnet 170 is thereupon energized and ymoves the side switch wipers 175, 164, 173 and 174 oit the impulse storing' echanisni from position 4 to position Side switch wiper 178 in moving-r from positionV 4V to position 5 opens the circuit toi' Ilay 160. rthis relay thereupon reti'acts its armature thus restoring' the switch L to normal` position thereby.V

to the selector switch S. Relay 161, in retractinp,V its armature opens the circuit for a slow-te-release relay 162. Relay 162, in retracting' its ari ature, closes a circuitA for reset magnet 171 over a path extending from grounded battery, winding ot magnet 171, oit-normal contacts 172 and. back contact of armature oic relay 162 to ground. Magnet 171, in. energizing, restores the sideY switch wipers associated with the impulse storing mechanism to normal position.V l y .et the completion of conversation and restoi ,st station 100, ground will be removed trom the test conductor 189 thereby causing the release of relay 198 which in deenergizing closes a circuit for release magnet 132 as previously described thereby causing' the restoration ot the switch S to normal. Switch S upon reaching' normal position causes the` release of the non-numerical switch N. The agparatrs` is then ready tor the nextccall.

What is claimed is:

1. 1n aV telephone exchange system, an automatic switch having,v trunk terminals arranged in groups, an impulse sender :tor operating'said switch to select a. desired group, and means responsive to the Ybusy condition of all the trunks of the selected group tor storingimpulses. Y

2.111. a telephone exchange system, an automatic switch having trunlr terminals arranged in groups, an impulse sender for operating' said switch to select a desired group, means responsive to the busy condi- Y group for storing impulses, means included yin the in the selected group to be seized, and means 'eftective when an idle trunk is seized for causing the impulse storing means to transmit the impulses stored therein.

ation of the receiver to the switchboard Y iio nasales In a telephone exchange system, au automatic switch having trunk terminals arranged in groups, an impulse sender for operating said switch to select a. particular group of trunks, means responsive to the busy condition of all the trunks et the selected group vtor storing impulses, means for operating said switch to seek a trunl: or' the-selected group as soon as one becomes idle, and means tor actuating said impulse storing means to deliver the stored impulses.

t. In a telephone exchange system, a train of switches, each switch in the train having` access to a group oit' trunk circuits, means includingan impulse sender for operating said switches in succession whereby each switchl prepares to select an idle trunk, an impulse storing mechanism accessible to a particularswitch in the train, and means responsive to the busy condition of all the trunks ot the group accessible to the particular switch for automatically connecting the impulse storing mechanism in operative relationship with said impulse sender.

5.` In a telephone eirchange system, a calling station, a numerical switch 'for entend-A ing a call therefrom, agroup of trunk circuits eXtending from terminals in said numerical switch to other numerical switches, means including an impulse sender at said callingstation for operating said numerical switch to extend said calling station from said switch to a succeeding switch, and means responsive to the busy condition of all the trunks extending from said switch orstoring impulses.

` 6. In a. telephone exchange system, a calling station, a numerical switch for extending a call therefrom, a group ot trunk circuits extending from terminals in said numerical switch to other numerical switches, means including an impulse sender at said calling station for operating said numerical switchto extend said calling station from said switch to a succeeding switch, means responsive to the busy condition ot all the 'trunks oit the selected group iter storing impulses, means included in the numerical switch tor causing the first idle trunk in the selected group to be seized, and means etective when an idle trunk is seized for causing the impulse storing means to transmit the impulses stored therein.

7. ln a telephone exchange system, an automatic switch,'groups oiE trunk circuits terminating therein, an impulse storing mechanism, an impulse sender tor sending a plurality of trains of impulses, one train operating said switch which proceeds to select an idle trunk in the desired group of trunks independently of said impulse storing mechanism if any one'of the trunk circuits of the desired group is not busy, and means responsive to the busy condition of all the trunks in the desired group for placing said impulse storing mechanism in operative relationship with said impulse sender to receive the succeeding trains of impulses.

8. ln a telephone exchange system, a train oiI automatic switches having primary and secondary movements, a sender for transmitting impulses to said switches, means responsive to impulses for operating one oit said switches in its primary movement, means for operating said switch in its secondary movement to select an idle trunk ertending thereform, means for delaying' the secondary movement in case all the desired trunks are busy, means at said switch tor storing impulses transmitted before the switch has commenced its secondary movement, means tor actuating said secondary movement operating means when one of the trunks becomes idle, and means actuated upon the seizure oi the trunk to release said impulse storing means to t'ansmit impulses to the succeeding' switches.

9. In a telephone exchange system, a train oil automatic switches having primary and secondary movements, a sender for transmitting impulses to said switches, means responsive to impulses tor operating one of said switches in its primary movement, means for operating said switch in its secondary movement, means accessible to said switch for storing impulses transmitted be- `tore the switch has commenced its secondary movement, means for delaying the secondary movement and means tor releasing said storing means to permit the stored impulses to be transmitted to a succeeding switch.

l0. ln a telephone exchange system, a telephone line, an automatic selecting switch having trunk terminals arranged in groups, an impulse storing mechanism, a sender adapted to set said switch in operative relation to one of said groups, means for thereupon automatically causing said switch to test the trunks of said group, means rendered operative if all-the trunks of the selected group are busy for preventing said testing operation from taking place, for holding said switch in its operated condition, and for placing said impulse storing mechanism in operative relationship with said impulse sender, means actuated when a trunk of the group becomes idle for causing said switch to test said trunks, and means actuatedwhen the terminals of an idle trunk are seized for releasing said impulse storing mechanism to permit the stored impulses to be transmitted.

In witness whereof we hereunto subscribe our names this 20th day of August, A. D.,

HENRY P. CLAUSEN. CHARLES L. GOODRUM. 

